Hot-air heating system



Oct. 10, 1950 w. SLIFER ETAL HOT-AIR HEATING SYSTEM 5 Sheets-Sheet 1 Erwin MM II I I Filed Sept. 10, 1948 I I I WAS/fer Fr. H. Summers fllqmdmmmvjm.

ATTORNEY I IlllIlI-l Oct. 10, 1950 w. L. SLIFER EI'AL HOT-AIR HEATING SYSTEM Filed Spt. 10, 1948 3 Sheets-Sheet 2 0/1 BURNER 1 E? H Summer;

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ATTORNEY W. L. SLIFER ETAL Oct. 10, 1950 HOT-AIR HEATING SYSTEM 3 Sheets-Sheet 5 Filed Sept. 10, 1948 Fla. 5

swam/M WLS/ffer ATTORNEY Patented Oct. It), 1950 HOT-AIR HEATING SYSTEM Wilmer L. Siifer, Middletown, and Russell H. a Summers, Boonsboro, Md.

Application September 10, 1948, Serial No. 48,714

The invention relates to hot air heating systems, having for an object to provide such a 2 Claims. (01. 237-55) Figure 3 is a section on theline 5-3, Figure l.

showing the frusto-conical end piece and its chimney supports.

Figure 8 shows detail plan and sectional views of the ring support for the frustoconical end piece and associated parts.

In these drawings, the furnace comprises an open-top flrepot I, and a closed-top drum 2, inverted over the flrepot, and higher than the flrepot to provide an upper chamber 3 above the flrepot for smoke and gaseous products of combustion, said drum having a diameter greater than that of the firepot and at its lower portion being spaced from the flrepot to provide an annular reverting flue 1 for smoke and gaseous products of combustion from the upper chamber 3. A central smoke flue 5 has the longitudinal axis thereof aligned with the longitudinal axes of the flrepot and of the drum, said smoke flue having lower diverging branches 6 overlying the drum, extending downwardly along the sides of the drum and at their lower ends communicating with said annular reverting flue 4.

An intermediate down-draft hot air flue is concentric with and surrounds said smoke flue 5, and an outer up-draft cold air flue 8 is concentric with and surrounds said hot air flue and. said smoke flue and at its lower end has 2 communication at 8 with the interiors of the rooms to be heated to withdraw cold air therefrom and at its upper end has communication at [0 with the upper end of said hot air flue.

A chimney H contains the three concentric flues, namely the smoke flue the hot air flue 1 and the cold air flue 8, thebri-ckwork of the chimney constituting the outer wall of said cold air flue 8, the chimney being either square or round and having a lower enlargement il' surrounding and of greater height and cross-sectional area than that of said drum 2 to provide an upper hot air chamber 82 above the drum with which the lower end of said hot air flue l communicates at it and a peripheral hot air chamber l l surrounding the drum 2, ducts i5 connecting this hot air chamber 56 with the rooms to be heated, to deliver the hot air thereto.

The flrepot I is preferably of sheet metal such as stainless steel, being preferably fired with a gun-type oil burner 15, said firepot being heated to a high degree or to a red heat, and the draft being somewhat choked by the annular reverting flue and the comparative dimensions of the smoke flue 5 and its branches d, the inverted drum 2 which is also preferably of stainless sheet steel will also become heated to a high degree. I

The lower diverging branches i of the smoke flue 5,0ver1ying the drum 2 and extending downwardly along the sides thereof contiguous or close thereto leave the exterior of the drum 2 exposed so that it will radiate the heat to a maximum degree to the hot air chamber i2 above the drum, and the hot air chamber hi surrounding the drum.

The cold air withdrawn from the rooms to be heated through the ports 9, travels first upwardly within the cold air flue 8, and becomes heated by the heat radiating from the exterior of the hot air flue l of tubular sheet metal; this air so withdrawn and heated thence passing through the passages H) downwardly through the hot air flue i, which latter is heated by the heat radiating, from the smoke flue 5, also of tubular sheet metal, so that this air becomes further heated, this heated air having its temperature again raised as it travels downwardly over the top of the drum 2 in the hot air chamber l2 and in the hot air chamber i4 surrounding the drum.-

Thus the hot air delivered through the ducts l5 to the rooms to be heated will reach a maximum degree of temperature in a minimum time after the furnace is fired.

This heated air delivered through the ducts I5 is preferably given a course around the rooms to be heated along the outer walls thereof at the base of said walls in peripheral ducts ll, which may be of sheet metal, replacing the original base boards in old houses.

The customary room thermostat will start and stop the oil burner l6 and will simultaneously start and stop the fan i 8 located in the air passage I 9 to facilitate the updraft of air in the cold air flue 8 and the downdraft through the hot air flue I. An independent thermostatic control may be suitably located to stop the oil burner and the fan in the event the furnace becomes too highly heated. Any suitable filters may be used to filter the air delivered to the rooms to be heated.

The tubular sheet metal cold air flue 8 may be made in sections as customary, with the lower end of the lower section telescoping over the upper tubular end of a frusto-conical end piece I 9 the exterior of which leads downwardly to the ports 9, an annulus or ring 29 located close to the brick work of the chimney supporting the lower end of the frusto-conical end piece l9, said ring having angle irons 2| connecting the same with horizontal metal plates 22 set in the said brick work. The tubular sheet metal smoke flue 5 may also be made in sections as customary, and have the lower end of the lower section thereof telescoping over the tubular upper end of the joint 23 connecting the upper ends of the branches 6 of the smoke flue.

We claim:

1. In a hot air heating system, a furnace comprising an open-top firepot and a closed-top drum inverted over higher than and concentric with the firepot to provide an upper chamber for smoke and gaseous products of combustion, said drum having a closed bottom and a diameter greater than that of the firepot and at its lower portion being spaced from the firepot to provide an annular reverting flue, said reverting flue having a pluraity of lateral openings, a central smoke flue the longitudinal axis of which is aligned with that of said firepot and said drum, said smoke flue having a plurality of spaced branches comprising converging portions and parallel portions, said parallel portions communicating at their lower ends with said lateral openings, and a chimney within which said smoke flue is located, said chimne having a base enlargement entirely surrounding and of greater height and cross-sectional area than that of said drum to provide an upper hot air chamber above the drum and within which said converging portions of the smoke flue branches are located and to provide a peri-pheral hot air chamber within which said parallel portions of the smoke flue branches are located, said upper hot air chamber having a source of air supply and said peripheral hot air chamber having air ducts communicating with the interiors of the rooms to be heated.

2. In a hot air heating system, a furnace comprising an open-top firepot and a closed-top drum inverted over higher than and concentric with the firepot to provide an upper chamber for smoke and gaseous products of combustion, said drum having a closed bottom and a diameter greater than that of the firepot and at its lower portion being spaced from the firepot to provide an annular reverting flue, said reverting flue being provided with a plurality of lateral openings, a central smoke flue the longitudinal axis of which is aligned with that of said firepot and said drum, said smoke flue having a plurality of spaced branches comprising converging portions and parallel portions, said parallel portions communicating with said lateral openings, a downdraft hot air flue concentric with said smoke flue, an outer up-draft cold air flue concentric with said hot air flue and said smoke flue and communicating with the interiors of the rooms to be heated to withdraw cold air therefrom and at its upper end communicating with the upper end of said hot air flue, and a chimney within which said three concentric flues are located, said chimney having a base enlargement entirely surrounding and of greater height and cross-sectional area than that of said drum to provide an u per hot air chamber above the drum with which the lower end of said down-draft hot air flue commun cates and within which are located said converging ortions of the smoke flue branch s and to provide a peri heral hot air chamber within which said parallel portions of the smoke flue branches are located, said peripheral hot air chamber having air ducts communicating with the interiors of the rooms to be heated to deliver the hot air thereto.

WILM'ER L. SLIFER. RUSSELL H. SUMMERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 289,634 Ernst Dec. 4, 1883 914,455 Piper Mar. 9, 1909 1,365,807 Weber Jan. 18, 1921 1,588,587 Klaus June 15, 1926 1,772,916 Schwab -1 Aug. 12, 1930 2,348,834 Mueller May 16, 1944 2,361,643 Mueller Oct. 31, 1944 

